WARNING! Access to this system is limited to authorised users only.
Unauthorised users may be subject to prosecution.
Unauthorised access to this system is a criminal offence under Australian law (Federal Crimes Act 1914 Part VIA)
It is a criminal offence to:
(1) Obtain access to data without authority. -Penalty 2 years imprisonment.
(2) Damage, delete, alter or insert data without authority. -Penalty 10 years imprisonment.
User activity is monitored and recorded. Anyone using this system expressly consents to such monitoring and recording.

To protect your data, the CISO officer has suggested users to enable 2FA as soon as possible.
Currently 2.7% of users enabled 2FA.

universe.py 10.8 KB
Newer Older
Stefan Marr's avatar
Stefan Marr committed
1
2
3
from som.interpreter.interpreter import Interpreter
from som.vm.symbol_table         import SymbolTable
from som.vmobjects.object        import Object
4
from som.vmobjects.clazz         import Class 
Stefan Marr's avatar
Stefan Marr committed
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

import os

class Universe(object):
    
    def __init__(self):
        self._interpreter    = Interpreter(self)
        self._symbol_table   = SymbolTable()
        
        self._globals        = {}
        
        self._nilObject      = None
        self._trueObject     = None
        self._falseObject    = None
        self._objectClass    = None
        self._classClass     = None
        self._metaclassClass = None
        
        self._nilClass       = None
        self._integerClass   = None
        self._bigintegerClass= None
        self._arrayClass     = None
        self._methodClass    = None
        self._symbolClass    = None
        self._frameClass     = None
        self._primitiveClass = None
        self._systemClass    = None
        self._blockClass     = None
        self._doubleClass    = None
        
        self._last_exit_code = 0
        self._classpath      = None
        self._dump_bytecodes = False        
38
39
40
41
    
    @property
    def nilObject(self):
        return self._nilObject
Stefan Marr's avatar
Stefan Marr committed
42
43
        
    
44
45
46
47
48
49
50
51
    def _create_bootstrap_method(self):
        # Create a fake bootstrap method to simplify later frame traversal
        bootstrap_method = self.new_method(self.symbol_for("bootstrap"), 1, 0)
        bootstrap_method.set_bytecode(0, Bytecodes.halt)
        bootstrap_method.set_number_of_locals(self.new_integer(0))
        bootstrap_method.set_maximum_number_of_stack_elements(self.new_integer(2))
        bootstrap_method.set_holder(self._systemClass)
    
Stefan Marr's avatar
Stefan Marr committed
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
    def interpret(self, arguments):
        # Check for command line switches
        arguments = self.handleArguments(arguments)

        # Initialize the known universe
        self.initialize(arguments)
        
        self.start()
    
    def handleArguments(self, arguments):
        got_classpath  = False
        remaining_args = []

        i = 0
        while i < len(arguments):
            if arguments[i] == "-cp":
                if i + 1 >= len(arguments):
                    self._print_usage_and_exit()
70
                self.setup_classpath(arguments[i + 1])
Stefan Marr's avatar
Stefan Marr committed
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
                i += 1    # skip class path
                got_classpath = True
            elif arguments[i] == "-d":
                self._dump_bytecodes = True
            else:
                remaining_args.append(arguments[i])
            i += 1 
    
        if not got_classpath:
            # Get the default class path of the appropriate size
            self._classpath = self._setup_default_classpath(0)

        # check remaining args for class paths, and strip file extension
        i = 0
        while i < len(remaining_args):
            split = self._get_path_class_ext(remaining_args[i])

            if split[0] != "":  # there was a path
                self._classpath.insert(0, split[0])
        
            remaining_args[i] = split[1]
            i += 1
        
        return remaining_args
    
96
    def setup_classpath(self, cp):
Stefan Marr's avatar
Stefan Marr committed
97
98
99
100
101
102
103
104
105
        self._classpath = cp.split(os.pathsep)
    
    # take argument of the form "../foo/Test.som" and return
    # "../foo", "Test", "som"
    def _get_path_class_ext(self, path):
        (path, file_name) = os.path.split(path)
        (file_name, ext)  = os.path.splitext(file_name)
        return (path, file_name, ext[1:])

106
    def _initialize_object_system(self):
Stefan Marr's avatar
Stefan Marr committed
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
        # Allocate the nil object
        self._nilObject = Object(None)

        # Allocate the Metaclass classes
        self._metaclassClass = self.new_metaclass_class()

        # Allocate the rest of the system classes
        self._objectClass     = self.new_system_class()
        self._nilClass        = self.new_system_class()
        self._classClass      = self.new_system_class()
        self._arrayClass      = self.new_system_class()
        self._symbolClass     = self.new_system_class()
        self._methodClass     = self.new_system_class()
        self._integerClass    = self.new_system_class()
        self._bigintegerClass = self.new_system_class()
        self._frameClass      = self.new_system_class()
        self._primitiveClass  = self.new_system_class()
        self._stringClass     = self.new_system_class()
        self._doubleClass     = self.new_system_class()

        # Setup the class reference for the nil object
128
        self._nilObject.set_class(self._nilClass)
Stefan Marr's avatar
Stefan Marr committed
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176

        # Initialize the system classes
        self._initialize_system_class(self._objectClass,                  None, "Object")
        self._initialize_system_class(self._classClass,      self._objectClass, "Class")
        self._initialize_system_class(self._metaclassClass,   self._classClass, "Metaclass")
        self._initialize_system_class(self._nilClass,        self._objectClass, "Nil")
        self._initialize_system_class(self._arrayClass,      self._objectClass, "Array")
        self._initialize_system_class(self._methodClass,      self._arrayClass, "Method")
        self._initialize_system_class(self._symbolClass,     self._objectClass, "Symbol")
        self._initialize_system_class(self._integerClass,    self._objectClass, "Integer")
        self._initialize_system_class(self._bigintegerClass, self._objectClass, "BigInteger")
        self._initialize_system_class(self._frameClass,       self._arrayClass, "Frame")
        self._initialize_system_class(self._primitiveClass,  self._objectClass, "Primitive")
        self._initialize_system_class(self._stringClass,     self._objectClass, "String")
        self._initialize_system_class(self._doubleClass,     self._objectClass, "Double")

        # Load methods and fields into the system classes
        self._load_system_class(self._objectClass)
        self._load_system_class(self._classClass)
        self._load_system_class(self._metaclassClass)
        self._load_system_class(self._nilClass)
        self._load_system_class(self._arrayClass)
        self._load_system_class(self._methodClass)
        self._load_system_class(self._symbolClass)
        self._load_system_class(self._integerClass)
        self._load_system_class(self._bigintegerClass)
        self._load_system_class(self._frameClass)
        self._load_system_class(self._primitiveClass)
        self._load_system_class(self._stringClass)
        self._load_system_class(self._doubleClass)

        # Load the generic block class
        self._blockClass = self._load_class(self._symbol_for("Block"))

        # Setup the true and false objects
        self._trueObject  = self._new_instance(self._load_class(self.symbol_for("True")))
        self._falseObject = self._new_instance(self._load_class(self.symbol_for("False")))

        # Load the system class and create an instance of it
        self._systemClass = self._load_class(self.symbol_for("System"))
        system_object = self._new_instance(self._systemClass)

        # Put special objects and classes into the dictionary of globals
        self.setGlobal(self.symbol_for("nil"),    self._nilObject)
        self.setGlobal(self.symbol_for("true"),   self._trueObject)
        self.setGlobal(self.symbol_for("false"),  self._falseObject)
        self.setGlobal(self.symbol_for("system"), self._systemObject)
        self.setGlobal(self.symbol_for("System"), self._systemClass)
177
        self.setGlobal(self.symbol_for("Block"),  self._blockClass)
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
        return system_object
    
    
    def new_array_with_length(self, length):
        # Allocate a new array and set its class to be the array class
        result = Array(self._nilObject)
        result.set_class(self._arrayClass)

        # Set the number of indexable fields to the given value (length)
        result.set_number_of_indexable_fields_and_clear(length, self._nilObject)

        # Return the freshly allocated array
        return result
  
    def new_array_from_list(self, values):
        # Allocate a new array with the same length as the list
        result = self.new_array_with_length(len(values))

        # Copy all elements from the list into the array
        for i in range(len(values)):
            result.set_indexable_field(i, values[i])
    
        # Return the allocated and initialized array
        return result
  
    def new_array_with_strings(self, strings):
        # Allocate a new array with the same length as the string array
        result = self.new_array_with_length(len(strings))

        # Copy all elements from the string array into the array
        for i in range(len(strings)):
            result.set_indexable_field(i, self.new_string(strings[i]))
    
        # Return the allocated and initialized array
        return result
213
214
215
216
217
218
219
220
221
222
223
    
    def new_metaclass_class(self):
        # Allocate the metaclass classes
        result = Class(self)
        result.set_class(Class(self))

        # Setup the metaclass hierarchy
        result.get_class().set_class(result)

        # Return the freshly allocated metaclass class
        return result
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
    
    def new_system_class(self):
        # Allocate the new system class
        system_class = Class(self)

        # Setup the metaclass hierarchy
        system_class.set_class(Class(self))
        system_class.get_class().set_class(self._metaclassClass)

        # Return the freshly allocated system class
        return system_class
    
    def _initialize_system_class(self, system_class, super_class, name):
        # Initialize the superclass hierarchy
        if super_class:
            system_class.setSuperClass(super_class)
            system_class.get_class().set_super_class(super_class.get_class())
        else:
            system_class.get_class().set_super_class(self._classClass)
    

        # Initialize the array of instance fields
        system_class.set_instance_fields(self.new_array_with_length(0))
        system_class.get_class().set_instance_fields(self.new_array_with_length(0))

        # Initialize the array of instance invokables
        system_class.set_instance_invokables(self.new_array_with_length(0))
        system_class.get_class().set_instance_invokables(self.new_array_with_length(0))

        # Initialize the name of the system class
        system_class.set_name(self.symbol_for(name))
        system_class.get_class().setName(self.symbol_for(name + " class"));

        # Insert the system class into the dictionary of globals
        self.set_global(system_class.get_name(), system_class)
    
    
    def get_global(self, name):
        # Return the global with the given name if it's in the dictionary of globals
        if self.has_global(name):
            return self._globals[name]

        # Global not found
        return None

    def set_global(self, name, value):
        # Insert the given value into the dictionary of globals
        self._globals[name] = value
  

    def has_global(self, name):
        # Returns if the universe has a value for the global of the given name
        return name in self._globals